The UK government has announced that those travelling into the country will need to show a negative coronavirus test pre-departure as it reintroduces Covid-19 restrictions due to the Omicron variant.

From 0400 GMT on Tuesday, anyone travelling to the UK will have to show evidence of a negative lateral flow or PCR test taken within the last 48 hours before boarding a flight, the health ministry said late on Saturday.

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This will apply to travelers aged over 12 from any country. Currently travelers have to take a PCR test within two days of arrival.

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The reintroduction of compulsory pre-departure testing prompted an angry response from the travel industry.

The Business Travel Association said that the measure would be a “hammer blow,” while the Airport Operators Association said that “pre-departure tests are a devastating blow, as they deter people from travelling.”

Justice Secretary Dominic Raab told Sky News that he knew the new measure was a “burden for the travel industry” but stressed the UK needed to act.

“We’ve got to take the measures targeted forensically to stop the new variant seeding in this country to create a bigger problem.”

The government has vowed it “will take further decisive action if necessary to contain the virus and new variant.”

The UK earlier banned flights from South Africa and put 10 African countries on its red list, meaning only UK and Irish citizens or UK residents can travel from there to the UK. Nigeria will join the list from Monday.

Experts cautioned that travel restrictions and bans will not halt the virus spread.

Statistician David Spiegelhalter, a University of Cambridge professor who co-authored a history of the pandemic, told Sky News that “travel restrictions at the moment are only going to slow things up a little bit.. but they’re not going to stop it (Omicron) and it’s going to come in.”

England has made masks compulsory again in shops and on public transport in response to the new variant, with 160 Omicron cases confirmed for far in the UK.

The UK has also extended its booster program to make all adults eligible.

Read more: South African official says number of children sick with COVID not cause for panic